Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Air and Fuel› Intake Manifolds and Components

Motordyne

Copper Iso Thermal Plenum Spacer

Name: Copper Iso Thermal Plenum Spacer
Brand: Motordyne
SKU: MD-516"C-

$355.78

SKU: MD-516"C-

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$100 Minimum Order

Non-Returnable Item

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Overview

The Motordyne Copper Iso Thermal plenum spacer is a 5/16" intake manifold spacer designed to improve performance. It adds 12HP-14HP by thermally isolating the upper and lower plenum, reducing heat soak. This spacer is compatible with engine covers and strut bars, and is suitable for cold weather use without the risk of throttle body freezing.

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The Motordyne Copper Iso Thermal plenum spacer is a 5/16" intake manifold spacer designed to enhance performance by mitigating heat soak. This copper spacer thermally isolates both the upper and lower plenum, directly contributing to an increase of 12HP-14HP. Its 5/16" thickness is optimized for overall performance gains. The Iso Thermal system design ensures that your plenum remains cool, effectively preventing throttle body freezing, even in cold weather conditions. The copper variant is specifically recommended for regions experiencing snowfall. This product is noted as not being sold or shipped to California due to CARB regulations. Additionally, international shipping is not available.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Motordyne
Part Number	MD-516"C-
Category	Air and Fuel

Videos

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Motordyne Plenum Spacer and MREV 2 Install - Infiniti G35

G35 Motordyne copper 5/16 plenum spacer just installed

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Motordyne Plenum Spacer & Copper Iso Thermal Upgrade vs Kinetix V+ Plenum Temperature Test

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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